Import BuildInPlacements type

Editor assessment

The subject `fix: import BuildInPlacements type` names the exact missing type import, which is a complete description of this small repair. The fix type fits a build or runtime error caused by an unimported type, and the symbol name substitutes for a scope. The body is absent, justified by the subject's completeness, while the `close #29015` footer is well-formed and links the report. No junk, no trailing period, appropriate length. A reader knows precisely what was wrong and what changed.